---_________ a day do you brush your tee...

---_________ a day do you brush your teeth? ---Twice.

A. How often B. How much

C. How many times D. How long

C 【解析】试题分析：How often多久一次；How much多少；How many times多少次；How long多长。根据下文，两次。可知上文问的是，你一天刷几次牙？故选C。考点：考查疑问词辨析

考点分析：

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